Grin ding-mill



G. A. YOUNG. GRINDING MILL.

(No Model!) Patented Dec. 16

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UNITED STATES FFICE.

GEORGE A. YOUNG, OF BROOKLYN, NE\V YORK.

GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 442,848, dated December 16, 1890. Application filed June 15, 1888. Renewed November 13, 1890. Serial No. 371,801. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE A. YOUNG, of Brooklyn, in the county of Kings and State of New York, have invented a certain new and useful Improvement in Grinding-Mills, of which the following is a specification.

My improvement relates to the class of mills adapted for grinding paint and similar materials.

I will describe a grinding-mill embodying my improvement in detail, and then point out the novel features in claims.

In the accompanying drawings, Figure 1 is a side elevation of a paint-mill embodying my improvement. Fig. 2 is a plan or top .view of the same. Fig. 3 is a front view showing in detail certain mechanism for adjusting one of the rollers of the mills. Fig. 4 is a view on an enlarged scale, illustrating certain of the mechanism shown more clearly.

in Fig. 3. Fig. 5 is a detail showing one of the guides conforming to the curve of the roller.

Similar letters of reference designate corresponding parts in all the figures.

A A designate the side portions of the main frame of the machine. These side portions are secured together by the rods n.

Journaled in the side portions A A of the frame is the main shaft B, upon which are fast and loose pulleys a a. Upon the main shaft is a gear-wheel a which gear-wheel meshes with a gear-wheel a mounted on a shaft a", journaled in suitable hearings on the main frame.

Upon the shaft o is mounted a roller O. Plates 1), centered upon the shaft a" and arranged at the ends of the roller 0, are adapted to be clamped by nuts I) to secure the roller in position. Motion is transmitted from the main shaft to the roller O by means of the gear-wheels a a O designates a roller mounted upon a shaft a journaled in movable bearings a and located to the front of the roller C. Plates 1) and nuts 6 secure the roller O in position on the shaft in manner similar to that described for the roller O. Upon the shaft a is a gear- -wheel a which meshes with a gear-wheel a on the shaft a Motion is thus transmitted to the roller O. The movablebearings a for the shaft O are adapted to move to and fro in slideways (1, formed in the portions A A of the frame. As shown, the upper and lower sides of these bearings are grooved, so as to receive portions of the main frame and prevent displacement of the bearings, whileadmitting of their to-and-fro movement. The roller O bears against the roller O with a yielding pressure. This is accomplished by means of springs e. arranged in housings d to the front of the bearings at. These springs bear at one of their ends against the bearings a and at their other ends against plates a within the housings d Set-screws d adapted to bear against the plates a", may be adjusted to vary the resistances of the spring 6. The object of causing the roller O to bear against the roller O with a yielding pressure is to admit of the passage of foreign substancessuch, for instance, as pieces of metalbetween the rollers without causing injury to the rollers. The paint or other material to be ground is delivered from a hopper E to the roller O and is taken off from such roller onto the roller O.

F F designate guides for directing the material to be ground toward the center of the roller O and prevent its passing off at the edges of the roller. These guides are longitudinally curved, and are secured near one of their ends to blocks If, preferably made of wood. These blocks are supported upon a bar G, which bar extends over and above the rollers and is secured near its ends to the portions A A of the frame. The blocks are thus supported by means of screw-threaded rods f, secured near one of their ends to the blocks and extending near their other ends through elongated apertures f in the bar G. Nut-sf on the rods f may be employed to secure the rods and thus the blocks and guides in any desired position. This adjustment provides for varying the position of the guides in the direction of the length of the roller O. By curving the guides F F longitudinally the material is caused to be directed toward the center of the roller. The lower edges of the guides are also curved, in this case to conform to the curve of. the roller, so that they may set closely against the same.

The roller O has a reciprocating move ment in the direction of its length. This movement is imparted to it by a pin or proroller 0.

jection g, extending through a box or casing ll, secured to the portion A of the frame. The pin or projection g enters a peripherical cam-groove in a cam 11, mounted on the shaft a. hen the shaft a is rotated, it will be readily seen that a toand-fro motion will be imparted to the roller 0. This motion materially facilitates the grinding of the paint or other material. I have shown a cam so constructed that there will be a single complete reciprocation of the roller-C at each rotation of the roller.

C designates a third roller mounted upon a shaftj, journaled in movable bearings 7 2. in the portions A A of the frame, arranged in manner similar to the bearings a forthe The roller 0 may be adjusted toward and from the roller C, but is not held against the latter with a yielding pressure.

The mode of adjustment of the roller is as follows: I designates a shaft journaled in suitable hearings on the main frame. Upon this shaft are mounted worms-ii. The worm 1; is loose on the shaft; but the worm 2" is fixed thereon. 1

J designates a clutch-piece having a feathered connection with the shaft 1, so that it may be slid freely to and fro thereon, but will yet be prevented from rotation independently of the said shaft. This clutchpiece is provided with teeth adapted to-engage other teetl1 upon one end of the loose worm i. A spring i surrounding the shaft I and hearing at one end against the clutchpiece J and at the other against ahand-wheel J ,operates to maintain-the clutch-piece J and the worm i normally in engagement. The worms 7; '11 engage worm-wheels J mounted upon screws J extending through suit-able apertures in the portions A A of the frame.

The inner portions of these screws engage tapped holes in the bearings h for the shaftj.

VV'hen the handrwheel'J is manipulated,.tl'reworms 2' 2" cause the rotation of the screwsJ and" thus the adjustment of the roller G towardand from the roller 0. \Vhen it is'desired to adjust but one end of the roller, theclutch-piece J may be moved backward] y by hand out of engagement with the worm 'z'. The rotation of the shaft will then operate to cause a rotation of the worm i only, and consequently the adjustment of the screw J" with A set-screw s-may' be employed to secure one of the screws J' 'in;

whichit is engagement.

position. Motion is transmitted to the roller C by a gear-Wheel on the shaft j, which:

the roller C and the roller O -at an increased Thisfacilitates the removal of'paint from the rollers andassists Speedover-the roller (3.

in the grinding.

It will of course be understood that paint or other material will be taken off from the roller 0 by the rollerU L designates a scraper for removing the paint or other material from the roller 0 This scraper has a knife-edge which bears quite firmly against the surface of the roller, so as to remove all or nearly all the paint or other material therefrom. The scraper is mounted, as here shown, upon a rectangular bar Z, which bar is secured near its ends in adjustable supports N N. The supports are in shape like bell-cranks, and are pivoted at their angles on a bar or red Z, extending across the front of the machine and into suitable apertures Z formed in projections Z upon the portions A A of the frame.

It is often desirable in grinding different kinds of material to cause the same to be scraped from the roller C at different heights on the roller. To provide for this, I providea series of the apertures Z arranged one above another in the projections Z and at corresponding heights in both projections. By 'shiftin-g the bar or rod Z into different corresponding pairs of the apertures Z the height of the scraper relatively to the roller 0 may be va ried. The lowerarms of the supports NN' are provided with screw-threaded apertures, through which extend set-screws Z These set-screws bear at their innerend's-against the portions A A of the frame. By' manipulating them inone direction the scra-permay be adj usted toward the roller C and by mani pulatin g them-=inthe other direction the scraper may be moved away from the said roller. Jam-nuts Z may be employed to set the screws in any desired position intowh-i'eh they may be adjusted.

In order to admit of the adjustment of' one side of the scraper only, I make the upper arm of thesupport N in sections-secured to- *gether by a screw Z, passing through longi tudinal slots Z in the two sections and held in position by a nut. By loosening this nut one of theseetions may be-adj usted relatively to the other, so as to bring the scraper nearer to or farther from the roller C upon one side, and by tightening the nut the two sections may be again secured together.

It will be seen that the teeth of the gear wheels (0 a arelonger than those of thegearwheels a a and 7a. This admits of thelongitudinal movement of the rollerO without at the same time maintaining the teethof the gears'in full engagement. The arrangement of the gear a on a main or driving shaft, which is independent of the shaft upon: which the roller 0 is mounted, is also advantageous, because it'admits of the-free longitudinal play'of said roller.

\Vhat- I: claim as-my invention, and-desire to secure by Letters Patent, is-

- 1. In a grinding-mill, the combination of a rotary roller having yielding bearings, a re- "t'ary roller having movable bearings and a reciprocating rotary roller arranged between the first-named rollers and bearing against the same, the said rollers rotating at different rates of speed and the central roller having one reciprocation at each complete revolution, substantially as specified.

2. In a grinding-mill, the combination, with a roller, of a scraper therefor, a support upon which said scraper is mounted, said support being in two adjustable sections and vertically adjustable on the frame, substantially as specified.

3. In a grinding-mill, the combination, with the frame having apertures and a roller, of a scraper therefor, a support for said scraper, comprising two adjustable sections, said support being capable of vertical adjustment in said apertures, and an adjusting device comprising a set-screw for adjusting the scraper toward and from the roller, substantially as specified.

4. In agrinding inill, the combination, with a roller, of a scraper therefor, and a support for said scraper, comprising two sections, one

of said sections being longitudinally adj ustable relatively to the other, substantially as specified.

5. In a grinding-mill, the combination, With a roller, of longitudinally-curved guides for material to be ground, said guides having curved surfaces to conform to the arc of the roller, and adjustable supports above the roller for said guides, substantially as specified.

(5. In a grinding-mill, the combination, with a roller, of guides for material to be ground, said guides having longitudinally-curved surfaces to conform to the arc of the roller and being also longitudinally curved, and adjustable supports above the roller for the said guides, substantially as specified.

G. A. YOUNG.

Witnesses:

JAMES D. GRIsWoLn, FRANK W. ELY. 

